The manhua is amazing, it's really original compared to the bulk of martial arts manhua. But you can tell it's his also a first work and there is great margin for improvements : the story was getting a bit kind of messy at the end of the arc, with too many events succeeding one another without...
Thank you @robotcat for the explanation ! I think I will have to re-read this arc from the begining, so many things happened since little Mo came to this city :)
Wow this arc is so complicated, so many betrayals. I understand that the senior sister would "incapacitate" little Mo to get the core for herself, but she went far beyond that by trapping him with a spirit who want to take over his body... (who is this spirit by the way ? Where did he come from...